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| Effects of biochar on polycyclic aromatic hydrocarbons(PAHs) bioaccumulation in Chinese cabbage |
| Received:December 06, 2016 |
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| KeyWord:biochar;PAHs;contaminated soil;Chinese cabbage;bioaccumulation |
| Author Name | Affiliation | E-mail | | PENG Bi-lian | Institute of Resource Ecosystem and Environment of Agriculture, Nanjing Agricultural University, Nanjing 210095, China | | | LIU Ming-long | Institute of Resource Ecosystem and Environment of Agriculture, Nanjing Agricultural University, Nanjing 210095, China | | | SUI Feng-feng | Institute of Resource Ecosystem and Environment of Agriculture, Nanjing Agricultural University, Nanjing 210095, China | | | PAN Zhi-ping | Institute of Resource Ecosystem and Environment of Agriculture, Nanjing Agricultural University, Nanjing 210095, China | | | LI Lian-qing | Institute of Resource Ecosystem and Environment of Agriculture, Nanjing Agricultural University, Nanjing 210095, China | lqli@njau.edu.cn | | PAN Gen-xing | Institute of Resource Ecosystem and Environment of Agriculture, Nanjing Agricultural University, Nanjing 210095, China | | | CHENG Kun | Institute of Resource Ecosystem and Environment of Agriculture, Nanjing Agricultural University, Nanjing 210095, China | |
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| Abstract: |
| Biochar technology provides a potential approach to mitigate soil pollution in agricultural production. However, limited studies have focused on the effects of different kinds of biochar on polycyclic aromatic hydrocarbons(PAHs) bioaccumulation. To address this issue, three kinds of biochar including wheat straw biochar(WBC), sludge biochar(SBC) and pig manure biochar(PBC) were prepared through the technology of oxygen limited pyrolysis, and a spot experiment was conducted to assess the mitigation effects of three kinds of biochar with the application rates of 1% and 2% on PAH transfer from contaminated urban soil to Chinese cabbage. The results showed that addition of different kinds of biochar significantly reduced the concentrations of all PAHs by 14.53%~49.41% in the Chinese cabbage compared to the control soil(P<0.05), and the mitigation effectiveness was observed in order of WBC > PBC > SBC. Compared with the 1% application rate, the concentrations of PAHs were decreased by 32.02% and 21.40% under 2% WBC and 2% PBC amendments, respectively, though no significant difference was observed between the application rates of SBC. For different PAHs, the 2~3 rings and 4~6 rings PAHs bioaccumulation were reduced by 0~30.81% and 30.72%~68.07% under biochar application. In addition, the production of Chinese cabbage was significantly increased by 20.03% and 22.28% under 2% WBC and PBC, respectively. Therefore, biochar amendments could be an effective approach to reduce crop uptake of PAHs while ensuring crop yield in contaminated soil. |
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